The double cone is a cone that allows you to drill both large and small.
It is used in various places such as bolts, screw nails, DIY and construction sites.
How to use
Usually used in combination with the outer K shape and the middle A shape.
If there is a hole in the case, the K and B type (pre-drilled hole guide) are combined to use for double hole processing.
You can replace the required size drill and use it.
Size:
K-type (outer cone): 1.2 inches (30 mm)
A type (inner cone) : 0.6 inches (15 mm)
Shaft Diameter: 0.5 inches (12 mm)
Material:
K-shape: special steel, A type: special steel